Spatial distribution and seasonal changes of pesticides in Lake Biwa, Japan

Sudo, Miki; Kawachi, Takeshi; Hida, Yoshifumi; Kunimatsu, Takao

doi:10.1007/s10201-003-0115-0

Cited by 48 publications

(27 citation statements)

References 16 publications

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“…More data are available for another Asian country, Japan. For example, in a study on the contamination of the lake Biwa, Sudo et al (2002Sudo et al ( & 2004 have shown that three of the pesticides most frequently found in this lake and in the rivers flowing into it were herbicides (simetryn, molinate and bromobutide), which are all used in paddy fields, and so found in numerous rice producing areas. It appears that triazines and in particular atrazine and simazine, are very frequently found in surface freshwater ecosystems worldwide, as are glyphosate and its degradation product, AMPA.…”

Section: Water Contamination In Some Specific Countriesmentioning

confidence: 99%

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

Villeneuve¹,

Larroudé²,

Humbert³

2011

Pesticides - Formulations, Effects, Fate

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Section: Water Contamination In Some Specific Countriesmentioning

confidence: 99%

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

Villeneuve¹,

Larroudé²,

Humbert³

2011

Pesticides - Formulations, Effects, Fate

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“…e pretilachlor in the water samples was extracted by solid-phase extraction, followed by concentration analysis according to a method described in a previous study. 15) e pretilachlor in the soil sample was extracted through accelerated solvent extraction [ASE-200 (Nippon Dionex, Osaka, Japan)]. Fi y to 100 g of each prepared soil sample was mixed thoroughly with diatomaceous earth, which was added as a drying and dispersing agent and then to a 33-mL extraction cell to completely ll it.…”

Section: Herbicide Analysismentioning

confidence: 99%

“…1) While herbicides, fungicides, and insecticides contribute to high cultivation yields, high-quality products, and e ective farm management, 2) a number of studies in Japan have revealed high concentrations of paddy herbicides in drainage canals, [3][4][5][6][7] rivers, [8][9][10][11][12][13] and lakes. 14,15) Because pesticides are generally composed of synthetic chemicals that are not present in nature, there is concern about their potential impact on the environment and human health.…”

Section: Introductionmentioning

confidence: 99%

Effect of percolation flow on herbicide loss from rice paddies

et al. 2012

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e fate and transport of pretilachlor, one of the most widely used rice-paddy herbicides in Japan, were monitored in a rice paddy plot for 28 days a er its application in the ve study years. e e ect of the percolation rate on herbicide loss was investigated.e concentration of pretilachlor in the paddy water was at its highest level within 2 days of application. e maximum concentration in percolated water was lower, and it was reached 1 or 2 days later than that in the paddy water. Almost all the pretilachlor loss was caused by percolation. e pretilachlor loss, as estimated from the amount that was applied and the cumulative percolation loss, ranged from 7.4 to 16.3%. In the ve study years, the average percolation rate for the 7 days following application ranged from 11.5 to 29.3 mm/day. e pretilachlor loss increased proportionally with the percolation rate for 7 days following application.

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“…Therefore, those at YRNB on R. Yodo were similarly cut off. All the concentrations of three pesticides were estimated to be constant at 0.1 µg/L by reference to the observation data obtained by Sudo (Sudo et al, 2002a(Sudo et al, , 2002b(Sudo et al, , 2004Sudo, 2011) for R.Seta. The slopes (< 1) of the straight lines indicate that the runoff ratios of pesticides from watershed areas and paddy field areas supplying the major rivers became smaller as these areas increased.…”

Section: Total Runoff Loads Of Pesticide In Watershed and Paddy Fieldmentioning

confidence: 99%

High-Frequency Observations of Pesticide Runoff Characteristics in Yodo River with Reference to Three Major Tributaries

Kawamura

Ebise

2014

J. of Wat. ^|^ Envir. Tech.

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Yodo River is an important source of tap water for 12 million people in Kinki area. The statistical characteristics in pesticide concentrations for R. Yodo and three major tributaries were made clear by high-frequency observations. The relationships between total pesticide loads during observation periods and the areas of river watershed and its paddy field became almost linear on a log-log graph. The mass balances of pesticide loads between the three major tributaries and R. Yodo during the downstream reach were calculated during the observation period. As the sums of total pesticide loads of the three major tributaries accorded to those of R. Yodo at Yodo River New Bridge during observation period in 2011, the decreases of pesticide loads by degradation during the downstream reach were considered to be very small. The frequency of routine observation was evaluated in order to precisely estimate the total runoff pesticide loads mainly during an irrigation period. The estimated total loads for three pesticides detected widely in long term during the monthly observation distributed widely in the range of 10 -472% of those by every three days of observations. The weights of the three pesticides in DI value (detecting index value) were calculated as 27 -88% of all pesticide species in the big rivers during the irrigation period.

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Spatial distribution and seasonal changes of pesticides in Lake Biwa, Japan

Cited by 48 publications

References 16 publications

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

Herbicide Contamination of Freshwater Ecosystems: Impact on Microbial Communities

Effect of percolation flow on herbicide loss from rice paddies

High-Frequency Observations of Pesticide Runoff Characteristics in Yodo River with Reference to Three Major Tributaries

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